Koroth Sarin, Ponnappa K C, Simon Elsy P, Bharath Subin, Vivek V J, Raveendran Chandini
Department of Conservative Dentistry and Endodontics, KMCT Dental College, Kozhikode, Kerala, India.
Department of Conservative Dentistry and Endodontics, Coorg Institute of Dental Science, Virajpet, Karnataka, India.
J Pharm Bioallied Sci. 2021 Nov;13(Suppl 2):S1098-S1101. doi: 10.4103/jpbs.jpbs_374_21. Epub 2021 Nov 10.
The purpose of this study is to evaluate and compare the incidence of dentinal defects after root canal shaping using rotary nickel-titanium (Ni-Ti) instruments (ProTaper Gold [PTG] and ProTaper Next [PTN]) and reciprocating instrument (WaveOne Gold [WOG]).
One hundred human mandibular premolars with single root and single canal with canal curvature <10° were randomly divided into five groups ( = 20 teeth per group). The root canals were instrumented using hand K-files (positive control), full sequence rotary files PTG and PTN, and reciprocating single-file system WOG. One group was left unprepared and served as negative control. Roots were sectioned horizontally at 3, 6, and 9 mm from the apex and evaluated under a stereomicroscope.
PTG, WOG, and PTN showed dentinal defects in 40%, 53.3%and 30% of the samples, respectively.
Irrespective of motion kinematics, dentinal defects are observed in all the Ni-Ti file groups. Within the limitations of the present study and the available literature, incidence of dentinal defects is less with instruments working in continuous rotation rather than instruments with reciprocating motion.
本研究旨在评估和比较使用旋转镍钛（Ni-Ti）器械（ProTaper Gold [PTG]和ProTaper Next [PTN]）以及往复式器械（WaveOne Gold [WOG]）进行根管预备后牙本质缺陷的发生率。
将100颗单根单根管且根管弯曲度<10°的人下颌前磨牙随机分为五组（每组20颗牙）。根管分别使用手用K锉（阳性对照）、全序列旋转锉PTG和PTN以及往复式单锉系统WOG进行预备。一组不做预备作为阴性对照。将牙根从根尖起分别在3、6和9mm处水平剖切，并在体视显微镜下进行评估。
PTG、WOG和PTN分别在40%、53.3%和30%的样本中出现牙本质缺陷。
无论运动学原理如何，所有镍钛锉组均观察到牙本质缺陷。在本研究及现有文献的局限性范围内，连续旋转工作的器械导致牙本质缺陷的发生率低于往复运动的器械。
